Die for making links for sprocket-chains



(No Model.)

W. A. MOGOOL.

y .DIE FOR MAKING LINKS POR SPROGKT CHAINS. l No. 461,268. 'Patented oct. 1&1891.

, has been as follows:

able iron, and, after cleaning,

' hotels .fo-r'. the pins drilled.

,'.UNITED STM-ES i' PATENT OFFICE.

' j WILLIAM ALLEN McoooL, oF BEAVER FAL-Ls, PENNSYLVANIA.

DVIAE FOR MAKING L'INK-S Foa s'PRocKET-CHAINS.

sPEcrFrcATIoN forming parc of Letters Patent. NQ. 4e1,2es,k1tea october'ie', 1.891. 1

Application med Myjzs, 1891.

To alZ whom it may concern:

Be itknown that I, WILLIAM ALLENMC- .COOL, of Beaver Falls, in thecountyof Beaver and State of Pennsylvania, have invented cer-.

tain new and useful Improvements inDies for Makingr Links for Sprocket-Chains; and I do hereby declare the following to bea full, clear, and exact description of the invention, vsuch as will enable others skilledin the art to which it appertains to make and use the' Same.

My inventiru relates to the manufacture of sprocket-chains for driving sprocket wheels ,-orpulleys; and my improvement is directed 130 tlreproduction ofthe intermediate or pinbearlngllinks of such chain from a strip of steel quickly, easily, accurately, uniformly,

every point with the gimwhereltS pinbearings in true lines, and itsvcost of' manufactu re greatly red uced; Ileretotore in chains of this construction the'mode of manufacture The intermediate or pinbearing links `have been made of cast malle the two parallel sides have beengmilled or grouud'otf to a gang, `the blank links then been placed in a jig, and the holes drilled`for the pinsf 'VVroughtiron or steel bars'have also been'rolledr or drawn,

having the desired 'form for the links, and the bar sawedof inlengths for the links and the Such chains have also been made with the intermediate or pinbearing links o f straps having 'their' ends riviL-d or iterlocked. Itis essential to good i results that the holes for the pins shall in everylcase be of exactly the same distance from center to center, that they shall be exactly parallel through the link, and that they shall be at exact rightangles with fits outer parallel sides; audit is for the manufacture of such chain-link parts to obtain these results that- I have devised the dies and the mode of using them to produce the intermediate orpin-bearing links, as illustrated in the accompanying drawings.

Referring to these drawings, Figure 1 represents the'dies in section asl they appear in the first :step in the operatioILof forming theY link. Fig. 2 shows 'isection dies adapted for use with a bit, overwhich the ends of the and to form a wearing-surface stanno. 393,866.- uiomoaei.)

strap lare'partiallyclosedfn the second step in the operation of forming;r the link. Figf showsin section fdies adapted for use with showsthe/intermediate bearing-link and the oo I I pin therefor, and Fig.'6 shows in iop view andV imsection aportion'of the chain.

The dies are constructed of three separate anddistinctpairs,each lpair jadapted for a a pair of dies comprising an intaglio-dieu and relieffdieb; andiherroeutismetlhe article is commenced'in ohe'pa'ir of lles'and finished in the other pairs.

Referring to the initial dies in Fig. 1,l the intaglio-die has 'a deep recess c made in `itsjgu pper surface, haviuga wi 'th just equallo the lengt-h of the finished lin ky its walls vertical, and itsbottom formed with a middle fiat ridge d, standing parallel with the walls, and with concave grooves e e, which correspond tothe` bearing ends of the link. The relief-die is formed with a tongue f, having vertical sides, and a bottom the counterpartaof that. of the ihtaglio-recess, and'it has a widthto allow it to enter the intaglio-recess and press and form 8 5 the strip of steel therein, with its ends stand. ing up between the recesswalls and the -tonguefwalls Referring to the intermediate dies in Fig.

2, the recess in the intaglio-die is made of'v a 9 0 width suficient to' form a dat bottom part i, joining thever'tical walls, and thecu rved bottom-on a level above that of the fiat ridge d, while the tongue f of this relief-die .has its bottom formed with a ridge d and concave grooves e e', like thebottom of 4the recess in the intaglio-die, with the grooves terminating in outwardly and downwardly inclined walls rm, standing out beyond and overthe vertical ends of the strip, vformed as in Fig. 1, to IOC press' and form these ends 2 2, sof-as t0 partia'lly close tl1em"over a bit n, which is the counterpart on both its sides of. the upper or inner side of the strip as formed in the inidistinct step in the operation ot forming `the' 65 tial dies. Thestrip taken from the' initial dieand the bit placed therein are together placed in the intermediate intaglio-dies, so'

tha the rei'ietdie inclined walls m will strike the straight ends 2 2 of the link-blank 'arid form them over the upper side of the bit. From these dies the partially-formed link is removed, the bit taken out and replaced by l pinsfmone in each partially-closed end, which are of the exact diameter of the pins used in j connecting the links of the chain, and this partially-formed link is placed vin the finishing-dies shown in Fig. 3, wherein the intagliof the link, thus forming theholcs of perfect circles, in perfect parallel relation-and at right angles to the outer sides ot the link, which are the im portant requirements of a sprocketf chain. in `this finishing operation the `iiat faces of the ridges d d of the intaglio-reeess and of the relieftongue'are coincident and form the web or flat part of the link in the center line of its holes, so thatl the greatest strength shall be obtained in the line of thel greatest strain ou the linkv and the bearing shall be equal at all sideson the pins. The recess in the'intaglilodie is preferably open at each end for convenience in placing and removing the link being formed.

As a means of preserving the parallelism of the iinkunder the various operations, removable plates may be provided to close one or both ends of the recess, as seen in Fig. 4.

iu separate relation on a suitable bench; but it isobvious that a series of such -dies may be arranged in a suitable revoluble head and operated l'continuously as a press.

The die-formed chain-link, prpduced as de-. scribed and to obtain the advantages stated, is a new article ot manufacture, so `far as I know and can find. 'w are the outer links, and u are the shouldered pins, of the chain in which tliepins are riveted, and x is the intermediate or piu-bearing link. The` tluee'steps by which this link is formedrender the operation continuous,

in which. its transfer is from one part of :the machine to another part, whereby one-halt"` of the link is first formed -by the joint action of the dies themselves. 'lhe ends of the link are next partially closed by the joint aetion of dies and a bit, and thev ends of the link finally closed, so as to he about square on the tical walls,

v v said intaglio and relief faces, for I prefer to arrange the several pairs otdies` web of the link by the joint acton'ot the dies, and a pin placed within each of the'partiallyclosed ends, thus producing the perfect link. I claim as my improvement- 1.. Diesor making'- linksf`- or. sproeketchains, comprising three separate riii'd'distinct parsVone pair for the initial, one'pairfor the intermediate, and onepair for thefinishing 7o steps in the operation, each pair having an intaglio-die formed with a recess having vera bottoni middle' fiatl ridge, and' concave grooves oil-,each side of thelatter for l forming one side ofthe finished link, a relief die for the initial intagiio-die,having a tongue face formedwith convex ridges and a middle. groove .the counterpartof the said initial intagliohrecess, a relief-die for the intermediate pair,havingatonguelfaceformedwith concave 8o .grooves and a middle ridge the'counterpart of the intaglio-recess, the grooves of said tongue terminating in downwardly and outwardly inclined walls, an independent hit, the coun terpart of'these last-named intaglio and re- 85 lief faces, over which the other side of the link is partially formed, al reliefclie for the finishing pair, having-a tongue-face formed with a ridge and concave-grooves the coun,- terpart of the said'intaglio-recess, andsepa'.- oo rate pins over which' the link-holes are finished, subsitantlallyas described.

l 2. For making links for sprocket-chains, a pair of dies eoniprisir'gan intaglio-die formed with a reeesshaving vertical walls, a bottom .95 flat ridge, and f concaveI grooves on each side of the latter, apreliet-die havingaiougue-t'ace formed with concave grooves and a middle ridge, the counterpart of the intaglio-recess, the grooves of said tongue terminating in loo downwardly and outwardly inclined wallen and an independent bit, the counterpart of v partially 4forming the link, substantially as described.

3. For making links for sprocket-chains, n m5 pairot'dies comprisinganintaglio-die formed j with a recess having vertical walls, a bottom fiat ridge, and concave grooves on each side of the latter, a relief-die having a tovngn`efnce `formed with coirdtve grooves and a`middle ifo ridge, the counterpart et the intagliwrecess, and separate pi'nsover which the llink-holes are finished, substantially as describedu 4.-'lhp die -fornied ehainlink herein des,

scribed, having its pin-bearing holes of per- 1154 feet circles and its web coincident`Y with the centersot' said holes', as shown and'idescribed.

Iutestimony 4whereof I have signed 'this'v specification in the presence of two subscribe ing witnessesrli v WILLIAM ALBEN MCCOOL.

\\' itnesses:

Ano. T. BROOK,

-Airrnon Weiss.: 

